Change port number for JUPYTERHUB_SERVICE_URL #268
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JupyterHub will add extensions to Jupyter ServerApp to configure some settings. It seems that newer versions of JupyterHub extensions will check the environment variable JUPYTERHUB_SERVICE_URL to determine the port and the base URL of the ServerApp and override the randomly generated port given in the batchspawner-singleuser.py file.
Therefore, I added some code to change the port of the JUPYTERHUB_SERVICE_URL variable before it is exported to the target machine. Since my setup uses base URL 0.0.0.0 (which is the default value), I do not need to change the base URL of the environment variable. Further modification might be needed to accommodate that.